JPS582540B2 - Mitsupeigata Koden Atssetsubi no Zetsuenha Kaikenshiyutsusouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting dielectric breakdown in closed high voltage switching equipment having a number of mutually partitioned gas chambers.

Thereby, a faulty part is detected by at least one fixed measuring device which is coupled to a determination device, a signaling device or a control device.

German Patent Application No. 1,665,637 discloses a gas-insulated high-pressure switchgear equipped with a monitoring device that shuts off when the pressure is higher than that during operation.

This is intended to eliminate ground fault arcs without incurring any cost.

That is, in the known method, the arc is not detected directly, but from the pressure increase caused by the heating of the gas.

When building known installations with multiple gas chambers, individual monitoring devices must be provided for each gas chamber.

The object of the invention is to depart from these known methods and to provide a device as described above which can be implemented without outlay, ie without special modifications to current equipment.

According to the invention, this object is achieved as follows.

That is, the measuring device is a sonoelectric transducer that detects the sound waves generated at the fracture site and transmitted from the capsule, and the sonoelectric transducer is used as a determination device through a frequency or amplitude-dependent filter and a timing device. , connected to a signaling device or control device.

A sonoelectric transducer that detects sound waves formed as a solid microphone is placed outside the capsule so that it can generate an electrical signal when a breakdown occurs.

This signal is passed through a frequency- or amplitude-dependent filter to remove noise and is then connected to a timer which is used to suppress signals not due to breakdown.

In high-voltage installations with a number of gas-tightly partitioned gas chambers of various configurations, it is advantageous to provide one sonoelectric transducer in the area of each gas chamber.

In a particularly advantageous version, a device is provided for detecting and evaluating the signals from all sonoelectric transducers in order to confirm the measurement results.

In order to apply the detection device according to the invention to high-voltage switchgear installations, where various noises influence the measurement results, the filter is made adjustable in its fundamental frequency or in its impedance.

In a preferred embodiment of the device according to the invention, the determining device, the signaling device or the control device has a storage device which is directly connected to the timing device.

These outlets are connected to the inputs of the AND element.

At this time, the second input of these AND elements is given from a relay or ground fault detection device that monitors high voltage switching equipment.

The advantages and details of the device of this invention will be further explained by way of examples.

The sealed high voltage switchgear shown in Fig. 1 includes a cable connection part 1,
It is composed of a straight line disconnector 2, a breaker 3, a pipe conductor 4 formed as a connection part, and a load disconnector 5.

The load disconnector 5 is connected on one side to a transformer connection 6 and on the other side to a load disconnector 7 used as a series disconnector, and further connected to a disconnector 9 and a load disconnector 10 via an earthing switch 8. .

The load disconnector 10 is connected to the transformer connection part 11 on one side and the disconnector 12 on the other side, and is further connected to a load disconnector 14 used as a series disconnector via an earthing switch 13, and further connected to a load disconnector 15. The load disconnector 15 has a transformer connection 16 on one side and a pipe conductor 1 formed as a connection on the other side.
7 is connected.

The pipe conductor 17 is connected to a circuit breaker 18, the other outlet of which is connected via a straight disconnector 19 to a cable connection 20.

There is a partition wall at location 21.

This divides the high-voltage installation into a number of gas-tight, arc-proof, mutually separated gas chambers.

In order to be able to identify the fault category after the occurrence of dielectric breakdown in a closed high-voltage installation, in the exemplary embodiment described here each chamber is equipped with at least one sonoelectric transducer as a measuring device.

The sonoelectric transducer is indicated at 22.

The arc created by insulation breakdown has a characteristic sound whose fundamental wave is twice the system frequency.

Therefore, a corresponding sound wave is generated at the fracture site, and this sound wave travels through the capsule and reaches the measuring device 22 connected to the capsule.

The instrument that first detected the characteristic sound waves provides a reference for detecting insulation breakdown in high-voltage equipment.

In the basic connection diagram shown in FIG. 2, only three sonoelectric transducers are connected for simplicity and are drawn with similarly drawn lines.

The output of the sonoelectric converter 22 is supplied to an amplifier 23.

This outlet is connected to a filter 24 set to twice the system frequency, for example 100 Hz.

Filter 24 is made so that its frequency can be adjusted.

It is set so that only a signal component exhibiting a characteristic frequency of 100 Hz appears at the output of the sonoelectric transducer.

The output signal of the filter 24 is sent to an amplifier 25 whose amplitude can be adjusted, and the output signal is sent to the selection device 2.
Sent to 6.

The selection device 26 is designed, for example, to block the transmission of all other microphones 22 by generating the first signal of the microphone.

In this way, the selection device 26 makes it possible to obtain unambiguous evidence as to the location of the detected sound within the enclosed high-voltage installation.

Filter 24 filters out all noise that does not exhibit characteristic frequencies in the fault arc.

Furthermore, only signals exhibiting the smallest amplitude are amplified by the amplifier 25 so that noise signals below a set value are not used.

In the closed high voltage switching equipment of the type shown in FIG. 1, when the circuit breaker 3 or 18 interrupts the load, there is a possibility that an arc similar in sound to the accident arc may occur.

For this reason, such closed high voltage equipment must be equipped with auxiliary equipment to prevent the detection of an interrupting arc.

Therefore, in FIG. 2, a timing device 27 is connected to the outlet of the selection device 26.

In principle, this is designed to allow the signal to pass only if the generated signal is longer than the arcing time of the circuit breaker.

In this way it is ensured that the breaking arc of the circuit breaker is not detected by the detection device according to the invention.

In addition, in closed equipment where other noise exists, for example, a large amplitude with a signal that vibrates at twice the system frequency, with a period exceeding the time set by the timer 27, the timer 27 suppresses such noise. For this purpose, it is advantageous for the signal sent from the timer to be sent to the storage element 28, which is supplied to the outlet, over a period of a long specified frequency.

The outlet of the storage element 28 is connected to the inlet of the AND element 29 in the embodiments already described.

The second inlet of the AND element is fed to a device 30 which can be either a relay or a ground fault detection device for disconnecting the circuit breaker.

In these ways, it is ensured that the AND element 29 provides a signal to the outlet 31 only in the event of a dielectric breakdown leading to tripping of the circuit breaker or isolation of the fault area.

The dielectric breakdown detection device for sealed high-voltage switchgear equipment is
In embodiments with identically constructed gas chambers, it is advantageous to have only one measuring device for each gas chamber, which is arranged symmetrically and coaxially.

As a result, dielectric breakdowns in high-voltage transmission lines can be monitored, possibly by remote measurement, without high costs.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a block diagram of a closed high voltage equipment having the device of the present invention, and FIG. 2 is a basic connection diagram of the device of the present invention. 22... Measuring device, 24... Filter, 25... Amplifier, 27... Timing device.

Claims (1)

[Claims] 1 having a number of gas chambers partitioned in a gas-tight manner such that dielectric breakdown in the gas chambers is detected by at least one fixed measuring device coupled to a determination device, a signal device or a control device; In the dielectric breakdown detection device for sealed high-voltage switchgear equipment, the measuring device detects dielectric breakdown occurring at the site of dielectric breakdown,
This is a sonoelectric transducer that detects the sound waves transmitted from the capsule, and this sonoelectric transducer detects the determination device, signal device or A dielectric breakdown exposure device for sealed high voltage switchgear equipment, characterized in that it is connected to a control device.